Clayton County, IA

214 public highway bridges

Clayton County Bridge Snapshot

Clayton County, Iowa contains 214 public highway bridges in the FHWA National Bridge Inventory. Roughly 32.2% are rated “Good,” 57.9% “Fair,” 9.8% “Poor,” and 9.8% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in IA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

214

Total Bridges

32.2%

Good

9.8%

Poor

9.8%

Structurally Deficient

Condition Distribution

Good

32.2% (69)

Fair

57.9% (124)

Poor

9.8% (21)

SD

9.8% (21)

All Bridges (214)

Sort:

310TH ST

Over: STREAM

1.8 miles S of 300th, Clayton, IA

Built 2018 Load: 32.7 t ADT: 73

290TH ST

Over: STREAM

0.5 miles W of Killdeer A, Clayton, IA

Built 2018 Load: 32.7 t ADT: 21

JOLES HOLLOW RD

Over: JOLES CREEK

0.5 miles E Kale Ave, Clayton, IA

Built 2018 Load: 32.7 t ADT: 29

HEMLOCK RD

Over: STREAM

092041004, Clayton, IA

Built 1999 Load: 32.7 t ADT: 30

EMPIRE RD

Over: STREAM

0.5 miles S 270th St, Clayton, IA

Built 2017 Load: 32.7 t ADT: 35

GLIDER AVE

Over: STREAM

094040706, Clayton, IA

Built 1985 Load: 32.7 t ADT: 73

ARMADA RD

Over: STREAM

1.9 miles N of hwy 56, Clayton, IA

Built 2020 Load: 32.7 t ADT: 21

HAWK AVE

Over: STREAM

1 mile N of Hwy 18, Clayton, IA

Built 2020 Load: 32.7 t ADT: 30

IOWA AVE

Over: SMALL STREAM

091042206, Clayton, IA

Built 2005 Load: 32.7 t ADT: 79

BELGIAM RD

Over: KLEINLEIN HOLLOW

091060204, Clayton, IA

Built 2004 Load: 33.7 t ADT: 30

IA 13

Over: TURKEY RIVER

0.1 MI. N OF JCT. IA 56, Clayton, IA

Built 1982 Load: 34.6 t ADT: 2,800

FAWN HOLLOW

Over: ROBERT'S CREEK

094053604, Clayton, IA

Built 1984 Load: 36.9 t ADT: 108

150TH ST

Over: ROBERTS CREEK

0.6 m E Concord Ave, Clayton, IA

Built 2016 Load: 37.9 t ADT: 26

205TH ST

Over: ROBERTS CREEK

094052503, Clayton, IA

Built 1991 Load: 37.9 t ADT: 304

HAWK AVE

Over: STREAM

0.6 miles S Hilton Rd, Clayton, IA

Built 2016 Load: 38.6 t ADT: 20

US 52

Over: BRANCH PONY CREEK

2.8 MI. N OF JCT IA 128, Clayton, IA

Built 1975 Load: 38.8 t ADT: 1,740

GALAXY RD

Over: TURKEY RIVER

092040689, Clayton, IA

Built 2012 Load: 38.9 t ADT: 30

AZTEC RD

Over: STREAM

093061904, Clayton, IA

Built 2020 Load: 39.2 t ADT: 35

EMBLEM RD

Over: COX CREEK

092051703, Clayton, IA

Built 2008 Load: 39.9 t ADT: 135

GRAPE RD

Over: DRY MILL CREEK

00000, Clayton, IA

Built 2011 Load: 39.9 t ADT: 79

DOLPHIN AVE

Over: HICKORY CREEK

On Blackberry Rd, Clayton, IA

Built 2013 Load: 40.2 t ADT: 98

130TH ST

Over: ROBERTS CREEK

0.5 miles E Gunder Rd, Clayton, IA

Built 2017 Load: 40.2 t ADT: 62

IA 128

Over: DRY MILL CREEK

2.4 MI. E OF JCT. IA 13, Clayton, IA

Built 1979 Load: 40.7 t ADT: 1,420

IA 76

Over: BLOODY RUN CREEK

0.2 MI. S OF N JCT. US 18, Clayton, IA

Built 1994 Load: 41.3 t ADT: 3,580

DOGWOOD AVE

Over: STREAM

.1 M S 100th st, Clayton, IA

Built 2020 Load: 41.8 t ADT: 16

JAGUAR RD

Over: ELK CREEK

000000000, Clayton, IA

Built 2009 Load: 42.8 t ADT: 579

MISSISSIPPI RD

Over: SMALL

093022908, Clayton, IA

Built 1979 Load: 43.4 t ADT: 157

C 5X HARVESTER RD

Over: BEAR CREEK

00000, Clayton, IA

Built 2011 Load: 43.7 t ADT: 108

B64 AGATE RD

Over: STREAM

0.5 miles E Bugle Rd, Clayton, IA

Built 2018 Load: 45.0 t ADT: 295

LACE AVE

Over: SMALL STREAM

093032510, Clayton, IA

Built 2005 Load: 45.7 t ADT: 11

KEYSTONE RD

Over: SNY MAGILL

094032202, Clayton, IA

Built 2017 Load: 46.3 t ADT: 62

BIG SPRING HATCH

Over: STREAM

IN BIG SPRING FISH HATCHE, Clayton, IA

Built 1992 Load: 46.7 t ADT: 10

172ND STREET

Over: ROBERTS CREEK

094050703, Clayton, IA

Built 1993 Load: 48.2 t ADT: 26

230TH STREET

Over: DRY MILL CREEK

093040801, Clayton, IA

Built 1993 Load: 49.8 t ADT: 44

165TH ST

Over: SILVER CREEK

094050505, Clayton, IA

Built 1990 Load: 50.0 t ADT: 137

SPOOK CAVE RD

Over: BLOODY RUN

095042204, Clayton, IA

Built 2004 Load: 50.0 t ADT: 113

CHERRYVALLEY RD

Over: SMALL STREAM

091022760, Clayton, IA

Built 2012 Load: 54.1 t ADT: 104

IOWA AVE

Over: ELK CREEK

T91,R4,S11, Clayton, IA

Built 2014 Load: 54.8 t ADT: 79

IRIS AVE

Over: BLOODY RUN

095042404, Clayton, IA

Built 1996 Load: 58.0 t ADT: 59

CRYSTAL RD

Over: STREAM

092062507, Clayton, IA

Built 1988 Load: 58.1 t ADT: 88

EVERGREEN RD

Over: VOLGA RIVER

092052206, Clayton, IA

Built 1995 Load: 70.7 t ADT: 88

GRAIN RD

Over: STREAM

T92, R4w, Sec5, Clayton, IA

Built 2014 Load: 99.9 t ADT: 11

NATURE AVE

Over: SMALL STREAM

T91N,R2W,Sec5, Clayton, IA

Built 2014 Load: 99.9 t ADT: 11

BRIDGE ST

Over: TURKEY RIVER

C25050530, Clayton, IA

Built 1889 Load: 4.5 t ADT: 4,755

A AVE

Over: STREAM

092060604, Clayton, IA

Built 1900 Load: 9.7 t ADT: 11

JUNE AVE

Over: SMALL STREAM

091030710, Clayton, IA

Built 1910 Load: 11.0 t ADT: 21

295TH ST

Over: STREAM

092051203, Clayton, IA

Built 1910 Load: 11.0 t ADT: 51

HORNET RD

Over: BEAR CREEK

092043303, Clayton, IA

Built 1923 Load: 11.7 t ADT: 73

HENNEPIN RD

Over: ELK CREEK

091040208, Clayton, IA

Built 1920 Load: 12.9 t ADT: 25

ACORN RD

Over: SMALL

091063003, Clayton, IA

Built 1951 Load: 13.6 t ADT: 11

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026